Apparatus for manufacturing metal tubes.



.No. 878,092. PATENTEDIPEB. 4, 1908.

A. scnwmem APPARAIUS FOR MANUFACTURING METAL TUB A'PPLIQATION FILED0O'I.-1. 1905.

No. 878,092. PATEKTED FEB. i908 A. SGHWTEGER.

w M w. I'XMQ/ misvspsz. I fPATENTED FBB. 4,-1908. A. SGHWIEGER.

APPARATUS FOR MANUFACTURING METAL TUBE-S.

APPLICATION TILED OO'ZA. 1905 .aaw: V

ARNOLD sonwraenn, OF 'BERLIN, GERMANY.

arranarns spa mnnracmme METAL TUBES.

are.- 878,092.

To an whom it may concern:

Beit known that 1-, ARNOLD SCH-WIEGEB, a subject of the German Em eror,and resident of Berlin, Germany, ccrt-alnnew and useful Improvements inApparatus for Manufacturing Metal Tubes,

which the following is a s ecification. The present invention re ates toa hydraulic press for manufacturing metal tubes and is an improvement onthe-press described in my co-pending application Serial No. 191,219,filed January 29, 1904,

In the present invention the mandrel which serves to perforate the metalbar is l fastened to the mandrel rod which passes through the hollowmain piston and the auxiliary piston, in such a manner that, afterhaving perforated the metal bar the mandrel is drawn back a little, andduring the forward movement of the main piston it is moved forwardstherewith in checked motion. This forward movement is effected by tworacks at the rear prolongation of the mandrel-rod with whose alternatelyplaced teeth engages" a double'toothed wheel, which is connected throughlevers with the draw bars which move the cross head guide of the mainpress piston. After the tube has been pressed, the mandrel-rod and themandrel can be drawn back, by the action of a weight or spring, into itsnormal osition, after the driving mechanism for t e racks has been putout of gear.

The press is illustrated in the accompanyin drawings in which l igure 1-is a longitudinal section through the press; Fig. 2 is a horizontalsection, and Fig. 31s a cross-section. Fig. 4 1s a sectional Similarletters refer to sim lar parts cross-head c by a hydraulically movedslide 0; z is the mandrel guided in the plunger h,

Z is the press-plate.

Q The mandrel-rod 8 passes through the hollow piston rod k of theauxiliary presspiston 0, which is guided centrally in the iollow mainpressiston g'of the main driving cylinder 6. e mandrel-rod s is ma- 5 vI chined at its rear prolongations s and rests with its shoulder againstthe bottom of the nut u,'w hich is screwed upon the end of the hollowpiston-rod 7:. To the prolongation s Specification er-gt'etters Patent.Application and emu-.54. .1905. Serial No. 281.347.

ave .iinvented- -The horizontal legs y of view showing the press adaptedfor pressing Patented Feb. 4, 18 08.

nately placed teeth,- and these 'mesh with two alternately arrangedtoothed wheels 1', rigidly l'eyed to the shaft w; to the ends of theshaft 10 are fastened two lateral arngsn), which are, moved by thedrawbars qare connected two rocks 2 and z with altercoupled to the lowercross-liead guide j) o the main pressiston. The length 0 the arms vrelatively to the radius ofthe wheels 1 is selected in such'a mannerthat reduced motion is transmitted from-the. guide 1) through the'bar (1arm 12,

wheels 1' and racks z z to the mandrel-rod s s and mandrel 'L.

In order to be able to lift the toothed wheels outof the racks, thereare arranged on the shaft w, in casings d, two erforated eccentrics a:connected to each 0t er by a bent shaft-t. the bent shaft are hollow, inorder to receive the shaft w of the toothed wheels. At one end of theshaft t is arranged a crank-arm j moved by a drawrod ,which is connectedto a lever B journaled on the platform S. If the lever is turnedforwards, that is to say to the left, the eccentrics, to ether with theshaft 11), are turned insuc a manner that the toothed wheels rare thrownout'of gear with their racks.

In order to draw back the mandrel i, a weight (not shown in thedrawings) may be caused to pull at the prolongation s, either throughanangle-lever or through a rope running overa pulley. But this arrangementdoes not form apart of the invention,

as the end of the racks may quite as well be connected to springs,.whichare tensioned by the forward movement of the mandrel-rod s s and drawback the mandrel-rod when the piston-o returns.

The mode of working is as follows. After the unperforated metal bar hasbeen put into the pressure cylinder a,'the driving device for themandrel 1s uncoupled by means of the lever B in the above describedmanner. Karen on the auxiliary press-piston 0 with the ho ow pistondriven forwards b hydraulic pressure, whereby the mandre -rod s;therolongation along with it, and the latteris forced through the metal barfor the pur ose of perforating it. Thereuponthe man rel is made toreturn under the action of a Weight, or spring, in the above describedmanner, to such an extent that its end 1) projects a few millirod is:and the nut u, is-

the racks z, z and the mandre i, are moved back so far that the Havingthus described my meters into the matrix Finallythedriving-device isthrown into gear by the lever B and the mandrel together with the mainpress-piston, is driven forwards, while the' mandrel advancescorrespondingly and with checked motion relativel to the mainpresspiston, so that gradual y and successively another part of thecore, as forinstance p p and so on, passes into the o enin of thematrix, and in this way the tu es will be sure to be always of the samediameter and the mandrel will be worn out uniformly. l/Vhen the pressingprocess is finished, the driving wheels 1' of the mandrel are'againdisconnected so that the mandrel can move backwards under the action ofthe said weight or s rin'g. If massive bodies are to be resse themandrel-rod s, with the mand el i, is drawn oint of he-core is behindthe face of the p unger h, whereu onan imperforate press-plate 1,instead of t 1e perforated plate], is placed upon the plunger as shownin Fig. 4. v invention, what I claim and desire to secure y LettersPatent 1. In a hydraulic press the ,combination with the plunger and itsdriving piston,-0f a mandrel, means for-moving ghe mandrel independentlyof the plunger and piston, and connection between the driving piston andthe mandrel whereby the mandrel may be firiven by the piston. i i 2. Ina hydraulic press, the combination with the plunger and its drivingpiston, of a mandrel, means for moving the mandrel independently of theplunger and piston and connection between the driving piston. and themandrel whereby the mandrel may be driven by the piston and at a speeddifferent from that of' the plunger.

' 3. In a'hydraulic ress, the combination with the ressu're cylinderterminating in a matrix, 0 'a plunger, a driving piston forthe plun er,a mandrel, means for pro'ecting the mandrel through the pressurecylinder into the matrix, anda connection between the drivinglpiston andthe mandrel whereby the mandre during thePm-zssing1 operation. Intestimony w ereof I have signed my name to this specification in the,presence of two subscribing witnesses.

' ARNOLD SCHWIEGER.

Witnesses:

HENRY HASPER,

WOLDEMAB. HAUPT.

is caused to advance in the matrix

